[rodrigofmacedo]

Well,

I'm not sure if I understood your question, so excuse me in advance if didn't answer the way you wanted to.

For Unit Hydrograph paired data (curvers data) HEC-HMS only accepts instantaneous velues (INST-VAL). Please double check Table 17, page 79, chapter 5 of the HEC-HMS 3.1.0 User's Manual. Therefore, your Unit Hydrograph must be configured as stated in the Manual.

Another problem may be how the C-PART in your Unit Hydrographic was specified.

Please double check the above mentioned page.

Hope that helps.